SIMATIC AX - Manual - AX2TIA - This package contains the documentation for ax2tia - Converting SIMATIC AX libraries to TIA Portal libraries,

FUNCTION Example : REF_TO BOOL
    VAR_INPUT
        inRefToBool : REF_TO BOOL;
    END_VAR
    VAR_OUTPUT
        outRefToBool : REF_TO BOOL;
    END_VAR
    ;
END_FUNCTION